Solar Simulator for Visible Light and UVA1 Skin Testing

The patent segments the solar spectrum into distinct wavelength ranges (UVC 280-315 nm, UVB 315-380 nm, UVA1 380-450 nm, and visible light 450-780 nm), allowing separate evaluation of sunscreen protection in each domain. This segmentation enables comprehensive testing of protection efficacy across all relevant spectral regions while maintaining structured, manageable test protocols.

The patent employs parameter changes by measuring sunscreen absorbance across multiple wavelength parameters (280-780 nm range) rather than a single parameter. By calculating critical wavelengths at different spectral boundaries (315 nm, 380 nm, 450 nm, 780 nm) and evaluating area under the curve for each segment, the method adapts to evaluate diverse sunscreen formulations with varying spectral profiles, including those designed for UVA1 and visible light protection.

The patent creates a universal testing framework that performs multiple functions: it calculates critical wavelengths at four different spectral boundaries (315 nm, 380 nm, 450 nm, 780 nm), evaluates area under the curve for each wavelength segment, and assesses both UV and visible light protection simultaneously. This multi-functional approach maintains testing efficiency while comprehensively evaluating protection across the entire 280-780 nm spectrum.